<template>
  <main class="page" :style="pageStyle">
    <ModuleTransition>
      <div v-show="recoShowModule && $page.title" class="page-title">
        <h1 class="title">{{$page.title}}</h1>
        <PageInfo :pageInfo="$page" :showAccessNumber="showAccessNumber"></PageInfo>
      </div>
    </ModuleTransition>

    <ModuleTransition delay="0.08">
      <Content v-show="recoShowModule" class="theme-reco-content" />
    </ModuleTransition>

    <ModuleTransition delay="0.16">
      <footer v-show="recoShowModule" class="page-edit">
        <div class="edit-link" v-if="editLink">
          <a :href="editLink" target="_blank" rel="noopener noreferrer">{{ editLinkText }}</a>
          <OutboundLink />
        </div>

        <div class="last-updated" v-if="lastUpdated">
          <span class="prefix">{{ lastUpdatedText }}: </span>
          <span class="time">{{ lastUpdated }}</span>
        </div>
      </footer>
    </ModuleTransition>

    <ModuleTransition delay="0.24">
      <div class="page-nav" v-if="recoShowModule && (prev || next)">
        <p class="inner">
          <span v-if="prev" class="prev">
            ←
            <router-link v-if="prev" class="prev" :to="prev.path">
              {{ prev.title || prev.path }}
            </router-link>
          </span>

          <span v-if="next" class="next">
            <router-link v-if="next" :to="next.path">
              {{ next.title || next.path }}
            </router-link>
            →
          </span>
        </p>
      </div>
    </ModuleTransition>

    <ModuleTransition delay="0.32">
      <Comments v-if="recoShowModule" :isShowComments="shouldShowComments" />
    </ModuleTransition>

    <ModuleTransition delay="0.08">
      <SubSidebar v-if="recoShowModule" class="side-bar" />
    </ModuleTransition>
  </main>
</template>

<script>
import PageInfo from '@theme/components/PageInfo'
import { resolvePage, outboundRE, endingSlashRE } from '@theme/helpers/utils'
import ModuleTransition from '@theme/components/ModuleTransition'
import moduleTransitonMixin from '@theme/mixins/moduleTransiton'
import SubSidebar from '@theme/components/SubSidebar'

export default {
  mixins: [moduleTransitonMixin],
  components: { PageInfo, ModuleTransition, SubSidebar },

  props: ['sidebarItems'],

  data () {
    return {
      isHasKey: true
    }
  },

  computed: {
    // 是否显示评论
    shouldShowComments () {
      const { isShowComments } = this.$frontmatter
      const { showComment } = this.$themeConfig.valineConfig || { showComment: true }
      return (showComment !== false && isShowComments !== false) || (showComment === false && isShowComments === true)
    },
    showAccessNumber () {
      const {
        $themeConfig: { valineConfig },
        $themeLocaleConfig: { valineConfig: valineLocalConfig }
      } = this

      const vc = valineLocalConfig || valineConfig
      if (vc && vc.visitor != false) {
        return true
      }
      return false
    },
    lastUpdated () {
      return this.$page.lastUpdated
    },
    lastUpdatedText () {
      if (typeof this.$themeLocaleConfig.lastUpdated === 'string') {
        return this.$themeLocaleConfig.lastUpdated
      }
      if (typeof this.$themeConfig.lastUpdated === 'string') {
        return this.$themeConfig.lastUpdated
      }
      return 'Last Updated'
    },
    prev () {
      const prev = this.$frontmatter.prev
      if (prev === false) {
        return
      } else if (prev) {
        return resolvePage(this.$site.pages, prev, this.$route.path)
      } else {
        return resolvePrev(this.$page, this.sidebarItems)
      }
    },
    next () {
      const next = this.$frontmatter.next
      if (next === false) {
        return
      } else if (next) {
        return resolvePage(this.$site.pages, next, this.$route.path)
      } else {
        return resolveNext(this.$page, this.sidebarItems)
      }
    },
    editLink () {
      if (this.$frontmatter.editLink === false) {
        return false
      }
      const {
        repo,
        editLinks,
        docsDir = '',
        docsBranch = 'master',
        docsRepo = repo
      } = this.$themeConfig

      if (docsRepo && editLinks && this.$page.relativePath) {
        return this.createEditLink(repo, docsRepo, docsDir, docsBranch, this.$page.relativePath)
      }
      return ''
    },
    editLinkText () {
      return (
        this.$themeLocaleConfig.editLinkText || this.$themeConfig.editLinkText || `Edit this page`
      )
    },
    pageStyle () {
      return this.$showSubSideBar ? {} : { paddingRight: '0' }
    }
  },

  created () {
    // console.log(this)
  },

  methods: {
    createEditLink (repo, docsRepo, docsDir, docsBranch, path) {
      const bitbucket = /bitbucket.org/
      if (bitbucket.test(repo)) {
        const base = outboundRE.test(docsRepo)
          ? docsRepo
          : repo
        return (
          base.replace(endingSlashRE, '') +
          `/src` +
          `/${docsBranch}/` +
          (docsDir ? docsDir.replace(endingSlashRE, '') + '/' : '') +
          path +
          `?mode=edit&spa=0&at=${docsBranch}&fileviewer=file-view-default`
        )
      }

      const base = outboundRE.test(docsRepo)
        ? docsRepo
        : `https://github.com/${docsRepo}`
      return (
        base.replace(endingSlashRE, '') +
        `/edit` +
        `/${docsBranch}/` +
        (docsDir ? docsDir.replace(endingSlashRE, '') + '/' : '') +
        path
      )
    }
  }
}

function resolvePrev (page, items) {
  return find(page, items, -1)
}

function resolveNext (page, items) {
  return find(page, items, 1)
}

function find (page, items, offset) {
  const res = []
  flatten(items, res)
  for (let i = 0; i < res.length; i++) {
    const cur = res[i]
    if (cur.type === 'page' && cur.path === decodeURIComponent(page.path)) {
      return res[i + offset]
    }
  }
}

function flatten (items, res) {
  for (let i = 0, l = items.length; i < l; i++) {
    if (items[i].type === 'group') {
      flatten(items[i].children || [], res)
    } else {
      res.push(items[i])
    }
  }
}

</script>

<style lang="stylus">
@require '../styles/wrapper.styl';

.page {
  position: relative;
  margin-top: -18rem;
  padding-top: 2rem;
  padding-bottom: 2rem;
  padding-right: 14rem;
  display: block;

  .side-bar {
    position: fixed;
    top: 10rem;
    bottom: 10rem;
    right: 3rem;
    overflow-y: scroll;

    &::-webkit-scrollbar {
      width: 0;
      height: 0;
    }
  }

  .page-title {
    max-width: $contentWidth;
    height: 15rem;
    margin: 0 auto;
    padding: 1rem 2.5rem;
    color: $whiteColor;
    text-align: center;
  }

  .page-edit {
    @extend $wrapper;
    padding-top: 1rem;
    padding-bottom: 1rem;
    overflow: auto;

    .edit-link {
      display: inline-block;

      a {
        color: $accentColor;
        margin-right: 0.25rem;
      }
    }

    .last-updated {
      float: right;
      font-size: 0.9em;

      .prefix {
        font-weight: 500;
        color: $accentColor;
      }

      .time {
        font-weight: 400;
        color: #aaa;
      }
    }
  }

  .comments-wrapper {
    @extend $wrapper;
  }
}

.page-nav {
  @extend $wrapper;
  padding-top: 1rem;
  padding-bottom: 0;

  .inner {
    min-height: 2rem;
    margin-top: 0;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    overflow: auto;
  }

  // clear float
  .next {
    float: right;
  }
}

@media (max-width: $MQMobile) {
  .page {
    padding-right: 0;

    .side-bar {
      display: none;
    }

    .page-title {
      padding: 0 1rem;
    }

    .page-edit {
      .edit-link {
        margin-bottom: 0.5rem;
      }

      .last-updated {
        font-size: 0.8em;
        float: none;
        text-align: left;
      }
    }
  }
}
</style>
